[PATCH iproute2-next 00/11] Clang warning fixes

[PATCH iproute2-next 00/11] Clang warning fixes

[Stephen Hemminger]

Building iproute2-next generates a lot of warnings and
finds a few bugs.  This patchset resolves many of these
warnings but some areas (BPF, RDMA, DCB) need more work.

Stephen Hemminger (11):
  tc: add format attribute to tc_print_rate
  utils: add format attribute
  netem: fix clang warnings
  m_vlan: fix formatting of push ethernet src mac
  flower: fix clang warnings
  nexthop: fix clang warning about timer check
  tc_util: fix clang warning in print_masked_type
  ipl2tp: fix clang warning
  can: fix clang warning
  tipc: fix clang warning about empty format string
  tunnel: fix clang warning

 include/utils.h |  4 +++-
 ip/ipl2tp.c     |  5 ++--
 ip/iplink_can.c |  5 ++--
 ip/ipnexthop.c  | 10 ++++----
 ip/tunnel.c     |  6 ++---
 tc/f_flower.c   | 62 +++++++++++++++++++++++--------------------------
 tc/m_vlan.c     |  4 ++--
 tc/q_netem.c    | 33 +++++++++++++++-----------
 tc/tc_util.c    | 21 +++++++----------
 tipc/link.c     |  2 +-
 10 files changed, 77 insertions(+), 75 deletions(-)

-- 
2.30.2

[PATCH iproute2-next 01/11] tc: add format attribute to tc_print_rate

[Stephen Hemminger]

From: Stephen Hemminger <stephen@networkplumber.org>

This catches future errors and silences warning from Clang.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 tc/tc_util.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tc/tc_util.c b/tc/tc_util.c
index 48065897cee7..6d5eb754831a 100644
--- a/tc/tc_util.c
+++ b/tc/tc_util.c
@@ -247,7 +247,8 @@ int get_percent_rate64(__u64 *rate, const char *str, const char *dev)
 	return get_rate64(rate, r_str);
 }
 
-void tc_print_rate(enum output_type t, const char *key, const char *fmt,
+void __attribute__((format(printf, 3, 0)))
+tc_print_rate(enum output_type t, const char *key, const char *fmt,
 		   unsigned long long rate)
 {
 	print_rate(use_iec, t, key, fmt, rate);
-- 
2.30.2

[PATCH iproute2-next 02/11] utils: add format attribute

[Stephen Hemminger]

From: Stephen Hemminger <stephen@networkplumber.org>

One more format attribute needed to resolve clang warnings.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 include/utils.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/utils.h b/include/utils.h
index b6c468e9cc86..d644202cc529 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -261,7 +261,9 @@ int print_timestamp(FILE *fp);
 void print_nlmsg_timestamp(FILE *fp, const struct nlmsghdr *n);
 
 unsigned int print_name_and_link(const char *fmt,
-				 const char *name, struct rtattr *tb[]);
+				 const char *name, struct rtattr *tb[])
+	__attribute__((format(printf, 1, 0)));
+
 
 #define BIT(nr)                 (UINT64_C(1) << (nr))
 
-- 
2.30.2

[PATCH iproute2-next 03/11] netem: fix clang warnings

[Stephen Hemminger]

From: Stephen Hemminger <stephen@networkplumber.org>

Netem is using empty format string to not print values.
Clang complains about this hack so don't do it.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 tc/q_netem.c | 33 ++++++++++++++++++++-------------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/tc/q_netem.c b/tc/q_netem.c
index 2e5a46ab7b25..c483386894ea 100644
--- a/tc/q_netem.c
+++ b/tc/q_netem.c
@@ -59,10 +59,12 @@ static void explain1(const char *arg)
 #define MAX_DIST	(16*1024)
 
 /* Print values only if they are non-zero */
-static void __print_int_opt(const char *label_json, const char *label_fp,
-			    int val)
+static void __attribute__((format(printf, 2, 0)))
+__print_int_opt(const char *label_json, const char *label_fp, int val)
 {
-	print_int(PRINT_ANY, label_json, val ? label_fp : "", val);
+	print_int(PRINT_JSON, label_json, NULL, val);
+	if (val != 0)
+		print_int(PRINT_FP, NULL, label_fp, val);
 }
 #define PRINT_INT_OPT(label, val)			\
 	__print_int_opt(label, " " label " %d", (val))
@@ -70,8 +72,8 @@ static void __print_int_opt(const char *label_json, const char *label_fp,
 /* Time print prints normally with varying units, but for JSON prints
  * in seconds (1ms vs 0.001).
  */
-static void __print_time64(const char *label_json, const char *label_fp,
-			   __u64 val)
+static void __attribute__((format(printf, 2, 0)))
+__print_time64(const char *label_json, const char *label_fp, __u64 val)
 {
 	SPRINT_BUF(b1);
 
@@ -85,8 +87,8 @@ static void __print_time64(const char *label_json, const char *label_fp,
 /* Percent print prints normally in percentage points, but for JSON prints
  * an absolute value (1% vs 0.01).
  */
-static void __print_percent(const char *label_json, const char *label_fp,
-			    __u32 per)
+static void __attribute__((format(printf, 2, 0)))
+__print_percent(const char *label_json, const char *label_fp, __u32 per)
 {
 	print_float(PRINT_FP, NULL, label_fp, (100. * per) / UINT32_MAX);
 	print_float(PRINT_JSON, label_json, NULL, (1. * per) / UINT32_MAX);
@@ -802,9 +804,10 @@ static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 		rate64 = rate64 ? : rate->rate;
 		tc_print_rate(PRINT_ANY, "rate", " rate %s", rate64);
 		PRINT_INT_OPT("packetoverhead", rate->packet_overhead);
-		print_uint(PRINT_ANY, "cellsize",
-			   rate->cell_size ? " cellsize %u" : "",
-			   rate->cell_size);
+
+		print_uint(PRINT_JSON, "cellsize", NULL, rate->cell_size);
+		if (rate->cell_size)
+			print_uint(PRINT_FP, NULL, " cellsize %u", rate->cell_size);
 		PRINT_INT_OPT("celloverhead", rate->cell_overhead);
 		close_json_object();
 	}
@@ -824,9 +827,13 @@ static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 		close_json_object();
 	}
 
-	print_bool(PRINT_ANY, "ecn", ecn ? " ecn " : "", ecn);
-	print_luint(PRINT_ANY, "gap", qopt.gap ? " gap %lu" : "",
-		    (unsigned long)qopt.gap);
+	print_bool(PRINT_JSON, "ecn", NULL, ecn);
+	if (ecn)
+		print_bool(PRINT_FP, NULL, " ecn ", ecn);
+
+	print_luint(PRINT_JSON, "gap", NULL, qopt.gap);
+	if (qopt.gap)
+		print_luint(PRINT_FP, NULL, " gap %lu", qopt.gap);
 
 	return 0;
 }
-- 
2.30.2

[PATCH iproute2-next 04/11] m_vlan: fix formatting of push ethernet src mac

[Stephen Hemminger]

This was reported as a clang warning:
    CC       m_vlan.o
m_vlan.c:282:32: warning: converting the enum constant to a boolean [-Wint-in-bool-context]
                if (tb[TCA_VLAN_PUSH_ETH_SRC &&
                                             ^

But it is really a bug in the code for displaying the pushed
source mac.

Fixes: d61167dd88b4 ("m_vlan: add pop_eth and push_eth actions")
Cc: gnault@redhat.com
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 tc/m_vlan.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tc/m_vlan.c b/tc/m_vlan.c
index 221083dfc0da..1b2b1d51ed2d 100644
--- a/tc/m_vlan.c
+++ b/tc/m_vlan.c
@@ -279,8 +279,8 @@ static int print_vlan(struct action_util *au, FILE *f, struct rtattr *arg)
 				    ETH_ALEN, 0, b1, sizeof(b1));
 			print_string(PRINT_ANY, "dst_mac", " dst_mac %s", b1);
 		}
-		if (tb[TCA_VLAN_PUSH_ETH_SRC &&
-		       RTA_PAYLOAD(tb[TCA_VLAN_PUSH_ETH_SRC]) == ETH_ALEN]) {
+		if (tb[TCA_VLAN_PUSH_ETH_SRC] &&
+		       RTA_PAYLOAD(tb[TCA_VLAN_PUSH_ETH_SRC]) == ETH_ALEN) {
 			ll_addr_n2a(RTA_DATA(tb[TCA_VLAN_PUSH_ETH_SRC]),
 				    ETH_ALEN, 0, b1, sizeof(b1));
 			print_string(PRINT_ANY, "src_mac", " src_mac %s", b1);
-- 
2.30.2

Re: [PATCH iproute2-next 04/11] m_vlan: fix formatting of push ethernet src mac

[Guillaume Nault]

On Sat, Jan 08, 2022 at 12:46:43PM -0800, Stephen Hemminger wrote:
> This was reported as a clang warning:
>     CC       m_vlan.o
> m_vlan.c:282:32: warning: converting the enum constant to a boolean [-Wint-in-bool-context]
>                 if (tb[TCA_VLAN_PUSH_ETH_SRC &&
>                                              ^
> 
> But it is really a bug in the code for displaying the pushed
> source mac.
> 
> Fixes: d61167dd88b4 ("m_vlan: add pop_eth and push_eth actions")
> Cc: gnault@redhat.com
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
>  tc/m_vlan.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tc/m_vlan.c b/tc/m_vlan.c
> index 221083dfc0da..1b2b1d51ed2d 100644
> --- a/tc/m_vlan.c
> +++ b/tc/m_vlan.c
> @@ -279,8 +279,8 @@ static int print_vlan(struct action_util *au, FILE *f, struct rtattr *arg)
>  				    ETH_ALEN, 0, b1, sizeof(b1));
>  			print_string(PRINT_ANY, "dst_mac", " dst_mac %s", b1);
>  		}
> -		if (tb[TCA_VLAN_PUSH_ETH_SRC &&
> -		       RTA_PAYLOAD(tb[TCA_VLAN_PUSH_ETH_SRC]) == ETH_ALEN]) {
> +		if (tb[TCA_VLAN_PUSH_ETH_SRC] &&
> +		       RTA_PAYLOAD(tb[TCA_VLAN_PUSH_ETH_SRC]) == ETH_ALEN) {
>  			ll_addr_n2a(RTA_DATA(tb[TCA_VLAN_PUSH_ETH_SRC]),
>  				    ETH_ALEN, 0, b1, sizeof(b1));
>  			print_string(PRINT_ANY, "src_mac", " src_mac %s", b1);

This is already fixed in iproute2 with commit 0e949725908b ("tc/m_vlan:
fix print_vlan() conditional on TCA_VLAN_ACT_PUSH_ETH").

[PATCH iproute2-next 05/11] flower: fix clang warnings

[Stephen Hemminger]

Clang complains about passing non-format string to print_string.
Handle this by splitting json and non-json parts.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
---
 tc/f_flower.c | 62 ++++++++++++++++++++++++---------------------------
 1 file changed, 29 insertions(+), 33 deletions(-)

diff --git a/tc/f_flower.c b/tc/f_flower.c
index 7f78195fd303..d6ff94ddbefb 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -1925,10 +1925,17 @@ static int __mask_bits(char *addr, size_t len)
 	return bits;
 }
 
-static void flower_print_eth_addr(char *name, struct rtattr *addr_attr,
+static void flower_print_string(const char *name, const char *value)
+{
+	print_nl();
+	print_string(PRINT_JSON, name, NULL, value);
+	print_string(PRINT_FP, NULL, "  %s", name);
+	print_string(PRINT_FP, NULL, " %s", value);
+}
+
+static void flower_print_eth_addr(const char *name, struct rtattr *addr_attr,
 				  struct rtattr *mask_attr)
 {
-	SPRINT_BUF(namefrm);
 	SPRINT_BUF(out);
 	SPRINT_BUF(b1);
 	size_t done;
@@ -1949,9 +1956,7 @@ static void flower_print_eth_addr(char *name, struct rtattr *addr_attr,
 			sprintf(out + done, "/%d", bits);
 	}
 
-	print_nl();
-	sprintf(namefrm, "  %s %%s", name);
-	print_string(PRINT_ANY, name, namefrm, out);
+	flower_print_string(name, out);
 }
 
 static void flower_print_eth_type(__be16 *p_eth_type,
@@ -2064,7 +2069,6 @@ static void flower_print_ip_addr(char *name, __be16 eth_type,
 {
 	struct rtattr *addr_attr;
 	struct rtattr *mask_attr;
-	SPRINT_BUF(namefrm);
 	SPRINT_BUF(out);
 	size_t done;
 	int family;
@@ -2095,10 +2099,9 @@ static void flower_print_ip_addr(char *name, __be16 eth_type,
 	else if (bits < len * 8)
 		sprintf(out + done, "/%d", bits);
 
-	print_nl();
-	sprintf(namefrm, "  %s %%s", name);
-	print_string(PRINT_ANY, name, namefrm, out);
+	flower_print_string(name, out);
 }
+
 static void flower_print_ip4_addr(char *name, struct rtattr *addr_attr,
 				  struct rtattr *mask_attr)
 {
@@ -2124,22 +2127,19 @@ static void flower_print_port_range(char *name, struct rtattr *min_attr,
 		print_hu(PRINT_JSON, "end", NULL, rta_getattr_be16(max_attr));
 		close_json_object();
 	} else {
-		SPRINT_BUF(namefrm);
 		SPRINT_BUF(out);
 		size_t done;
 
 		done = sprintf(out, "%u", rta_getattr_be16(min_attr));
 		sprintf(out + done, "-%u", rta_getattr_be16(max_attr));
-		print_nl();
-		sprintf(namefrm, "  %s %%s", name);
-		print_string(PRINT_ANY, name, namefrm, out);
+
+		flower_print_string(name, out);
 	}
 }
 
 static void flower_print_tcp_flags(const char *name, struct rtattr *flags_attr,
 				   struct rtattr *mask_attr)
 {
-	SPRINT_BUF(namefrm);
 	SPRINT_BUF(out);
 	size_t done;
 
@@ -2150,9 +2150,7 @@ static void flower_print_tcp_flags(const char *name, struct rtattr *flags_attr,
 	if (mask_attr)
 		sprintf(out + done, "/%x", rta_getattr_be16(mask_attr));
 
-	print_nl();
-	sprintf(namefrm, "  %s %%s", name);
-	print_string(PRINT_ANY, name, namefrm, out);
+	flower_print_string(name, out);
 }
 
 static void flower_print_ct_state(struct rtattr *flags_attr,
@@ -2237,16 +2235,20 @@ static void flower_print_ct_mark(struct rtattr *attr,
 	print_masked_u32("ct_mark", attr, mask_attr, true);
 }
 
-static void flower_print_key_id(const char *name, struct rtattr *attr)
+static void flower_print_uint(const char *name, unsigned int val)
 {
-	SPRINT_BUF(namefrm);
+	print_nl();
+	print_uint(PRINT_JSON, name, NULL, val);
+	print_string(PRINT_FP, NULL, "  %s", name);
+	print_uint(PRINT_FP, NULL, " %%u", val);
+}
 
+static void flower_print_key_id(const char *name, struct rtattr *attr)
+{
 	if (!attr)
 		return;
 
-	print_nl();
-	sprintf(namefrm, "  %s %%u", name);
-	print_uint(PRINT_ANY, name, namefrm, rta_getattr_be32(attr));
+	flower_print_uint(name, rta_getattr_be32(attr));
 }
 
 static void flower_print_geneve_opts(const char *name, struct rtattr *attr,
@@ -2342,8 +2344,9 @@ static void flower_print_erspan_opts(const char *name, struct rtattr *attr,
 	sprintf(strbuf, "%u:%u:%u:%u", ver, idx, dir, hwid);
 }
 
-static void flower_print_enc_parts(const char *name, const char *namefrm,
-				   struct rtattr *attr, char *key, char *mask)
+static void __attribute__((format(printf, 2, 0)))
+flower_print_enc_parts(const char *name, const char *namefrm,
+		       struct rtattr *attr, char *key, char *mask)
 {
 	char *key_token, *mask_token, *out;
 	int len;
@@ -2431,7 +2434,6 @@ static void flower_print_masked_u8(const char *name, struct rtattr *attr,
 {
 	const char *value_str = NULL;
 	__u8 value, mask;
-	SPRINT_BUF(namefrm);
 	SPRINT_BUF(out);
 	size_t done;
 
@@ -2451,9 +2453,7 @@ static void flower_print_masked_u8(const char *name, struct rtattr *attr,
 	if (mask != UINT8_MAX)
 		sprintf(out + done, "/%d", mask);
 
-	print_nl();
-	sprintf(namefrm, "  %s %%s", name);
-	print_string(PRINT_ANY, name, namefrm, out);
+	flower_print_string(name, out);
 }
 
 static void flower_print_u8(const char *name, struct rtattr *attr)
@@ -2463,14 +2463,10 @@ static void flower_print_u8(const char *name, struct rtattr *attr)
 
 static void flower_print_u32(const char *name, struct rtattr *attr)
 {
-	SPRINT_BUF(namefrm);
-
 	if (!attr)
 		return;
 
-	print_nl();
-	sprintf(namefrm, "  %s %%u", name);
-	print_uint(PRINT_ANY, name, namefrm, rta_getattr_u32(attr));
+	flower_print_uint(name, rta_getattr_u32(attr));
 }
 
 static void flower_print_mpls_opt_lse(struct rtattr *lse)
-- 
2.30.2

Re: [PATCH iproute2-next 05/11] flower: fix clang warnings

[David Ahern]

On 1/8/22 1:46 PM, Stephen Hemminger wrote:
> @@ -1925,10 +1925,17 @@ static int __mask_bits(char *addr, size_t len)
>  	return bits;
>  }
>  
> -static void flower_print_eth_addr(char *name, struct rtattr *addr_attr,
> +static void flower_print_string(const char *name, const char *value)
> +{
> +	print_nl();
> +	print_string(PRINT_JSON, name, NULL, value);
> +	print_string(PRINT_FP, NULL, "  %s", name);
> +	print_string(PRINT_FP, NULL, " %s", value);
> +}
> +

The last 3 lines could be a generic print_string_name_value function
under lib.


> @@ -2237,16 +2235,20 @@ static void flower_print_ct_mark(struct rtattr *attr,
>  	print_masked_u32("ct_mark", attr, mask_attr, true);
>  }
>  
> -static void flower_print_key_id(const char *name, struct rtattr *attr)
> +static void flower_print_uint(const char *name, unsigned int val)
>  {
> -	SPRINT_BUF(namefrm);
> +	print_nl();
> +	print_uint(PRINT_JSON, name, NULL, val);
> +	print_string(PRINT_FP, NULL, "  %s", name);
> +	print_uint(PRINT_FP, NULL, " %%u", val);

s/%%u/%u/ ?

Same here the last 3 lines could be a lib function.

[PATCH iproute2-next 06/11] nexthop: fix clang warning about timer check

[Stephen Hemminger]

Clang correctly flags that ipnexthop is comparing timer
with a value that it can never have.

On 64 bit platform ~0UL / 100  = 184467440737095516
and timer is u32 so max is 4294967295.

Fixes: 91676718228b ("nexthop: Add support for resilient nexthop groups")
Cc: idosch@nvidia.com
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
---
 ip/ipnexthop.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/ip/ipnexthop.c b/ip/ipnexthop.c
index 83a5540e771c..2c65df294587 100644
--- a/ip/ipnexthop.c
+++ b/ip/ipnexthop.c
@@ -31,6 +31,8 @@ enum {
 	IPNH_FLUSH,
 };
 
+#define TIMER_MAX   (~(__u32)0 / 100)
+
 #define RTM_NHA(h)  ((struct rtattr *)(((char *)(h)) + \
 			NLMSG_ALIGN(sizeof(struct nhmsg))))
 
@@ -839,8 +841,8 @@ static void parse_nh_group_type_res(struct nlmsghdr *n, int maxlen, int *argcp,
 			__u32 idle_timer;
 
 			NEXT_ARG();
-			if (get_unsigned(&idle_timer, *argv, 0) ||
-			    idle_timer >= ~0UL / 100)
+			if (get_u32(&idle_timer, *argv, 0) ||
+			    idle_timer >= TIMER_MAX)
 				invarg("invalid idle timer value", *argv);
 
 			addattr32(n, maxlen, NHA_RES_GROUP_IDLE_TIMER,
@@ -849,8 +851,8 @@ static void parse_nh_group_type_res(struct nlmsghdr *n, int maxlen, int *argcp,
 			__u32 unbalanced_timer;
 
 			NEXT_ARG();
-			if (get_unsigned(&unbalanced_timer, *argv, 0) ||
-			    unbalanced_timer >= ~0UL / 100)
+			if (get_u32(&unbalanced_timer, *argv, 0) ||
+			    unbalanced_timer >= TIMER_MAX)
 				invarg("invalid unbalanced timer value", *argv);
 
 			addattr32(n, maxlen, NHA_RES_GROUP_UNBALANCED_TIMER,
-- 
2.30.2

Re: [PATCH iproute2-next 06/11] nexthop: fix clang warning about timer check

[Ido Schimmel]

On Sat, Jan 08, 2022 at 12:46:45PM -0800, Stephen Hemminger wrote:
> diff --git a/ip/ipnexthop.c b/ip/ipnexthop.c
> index 83a5540e771c..2c65df294587 100644
> --- a/ip/ipnexthop.c
> +++ b/ip/ipnexthop.c
> @@ -31,6 +31,8 @@ enum {
>  	IPNH_FLUSH,
>  };
>  
> +#define TIMER_MAX   (~(__u32)0 / 100)
> +
>  #define RTM_NHA(h)  ((struct rtattr *)(((char *)(h)) + \
>  			NLMSG_ALIGN(sizeof(struct nhmsg))))
>  
> @@ -839,8 +841,8 @@ static void parse_nh_group_type_res(struct nlmsghdr *n, int maxlen, int *argcp,
>  			__u32 idle_timer;
>  
>  			NEXT_ARG();
> -			if (get_unsigned(&idle_timer, *argv, 0) ||
> -			    idle_timer >= ~0UL / 100)
> +			if (get_u32(&idle_timer, *argv, 0) ||
> +			    idle_timer >= TIMER_MAX)
>  				invarg("invalid idle timer value", *argv);
>  
>  			addattr32(n, maxlen, NHA_RES_GROUP_IDLE_TIMER,
> @@ -849,8 +851,8 @@ static void parse_nh_group_type_res(struct nlmsghdr *n, int maxlen, int *argcp,
>  			__u32 unbalanced_timer;
>  
>  			NEXT_ARG();
> -			if (get_unsigned(&unbalanced_timer, *argv, 0) ||
> -			    unbalanced_timer >= ~0UL / 100)
> +			if (get_u32(&unbalanced_timer, *argv, 0) ||
> +			    unbalanced_timer >= TIMER_MAX)
>  				invarg("invalid unbalanced timer value", *argv);

I believe these were already addressed by:
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=5f8bb902e14f91161f9ed214d5fc1d813af8ed88

>  
>  			addattr32(n, maxlen, NHA_RES_GROUP_UNBALANCED_TIMER,
> -- 
> 2.30.2
> 

Re: [PATCH iproute2-next 06/11] nexthop: fix clang warning about timer check

[David Ahern]

On 1/8/22 1:46 PM, Stephen Hemminger wrote:
> diff --git a/ip/ipnexthop.c b/ip/ipnexthop.c
> index 83a5540e771c..2c65df294587 100644
> --- a/ip/ipnexthop.c
> +++ b/ip/ipnexthop.c
> @@ -31,6 +31,8 @@ enum {
>  	IPNH_FLUSH,
>  };
>  
> +#define TIMER_MAX   (~(__u32)0 / 100)

UINT_MAX instead of "~(__u32)0)"

[PATCH iproute2-next 07/11] tc_util: fix clang warning in print_masked_type

[Stephen Hemminger]

Clang complains about passing a non-format string but the code here
was doing extra work the JSON case.  It was also broken if using oneline mode.

Fixes: 04b215015ba8 ("tc_util: introduce a function to print JSON/non-JSON masked numbers")
Cc: elibr@mellanox.com
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 tc/tc_util.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/tc/tc_util.c b/tc/tc_util.c
index 6d5eb754831a..c95b6fd6e49d 100644
--- a/tc/tc_util.c
+++ b/tc/tc_util.c
@@ -783,7 +783,6 @@ static void print_masked_type(__u32 type_max,
 			      const char *name, struct rtattr *attr,
 			      struct rtattr *mask_attr, bool newline)
 {
-	SPRINT_BUF(namefrm);
 	__u32 value, mask;
 	SPRINT_BUF(out);
 	size_t done;
@@ -795,26 +794,21 @@ static void print_masked_type(__u32 type_max,
 	mask = mask_attr ? rta_getattr_type(mask_attr) : type_max;
 
 	if (is_json_context()) {
-		sprintf(namefrm, "\n  %s %%u", name);
-		print_hu(PRINT_ANY, name, namefrm,
-			 rta_getattr_type(attr));
+		print_hu(PRINT_JSON, name, NULL, value);
 		if (mask != type_max) {
 			char mask_name[SPRINT_BSIZE-6];
 
 			sprintf(mask_name, "%s_mask", name);
-			if (newline)
-				print_string(PRINT_FP, NULL, "%s ", _SL_);
-			sprintf(namefrm, " %s %%u", mask_name);
-			print_hu(PRINT_ANY, mask_name, namefrm, mask);
+			print_hu(PRINT_JSON, mask_name, NULL, mask);
 		}
 	} else {
 		done = sprintf(out, "%u", value);
 		if (mask != type_max)
 			sprintf(out + done, "/0x%x", mask);
-		if (newline)
-			print_string(PRINT_FP, NULL, "%s ", _SL_);
-		sprintf(namefrm, " %s %%s", name);
-		print_string(PRINT_ANY, name, namefrm, out);
+
+		print_nl();
+		print_string(PRINT_FP, NULL, " %s", name);
+		print_string(PRINT_FP, NULL, " %s", out);
 	}
 }
 
-- 
2.30.2

[PATCH iproute2-next 08/11] ipl2tp: fix clang warning

[Stephen Hemminger]

Clang complains about passing non-format string.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 ip/ipl2tp.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ip/ipl2tp.c b/ip/ipl2tp.c
index 77bc3249c7ec..569723581ec2 100644
--- a/ip/ipl2tp.c
+++ b/ip/ipl2tp.c
@@ -191,8 +191,9 @@ static int delete_session(struct l2tp_parm *p)
 	return 0;
 }
 
-static void print_cookie(const char *name, const char *fmt,
-			 const uint8_t *cookie, int len)
+static void __attribute__((format(printf, 2, 0)))
+print_cookie(const char *name, const char *fmt,
+	     const uint8_t *cookie, int len)
 {
 	char abuf[32];
 	size_t n;
-- 
2.30.2

[PATCH iproute2-next 09/11] can: fix clang warning

[Stephen Hemminger]

Fix warning about passing non-format string.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 ip/iplink_can.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ip/iplink_can.c b/ip/iplink_can.c
index f4b375280cd7..67c913808083 100644
--- a/ip/iplink_can.c
+++ b/ip/iplink_can.c
@@ -330,8 +330,9 @@ static void can_print_nl_indent(void)
 	print_string(PRINT_FP, NULL, "%s", "\t ");
 }
 
-static void can_print_timing_min_max(const char *json_attr, const char *fp_attr,
-				     int min, int max)
+static void __attribute__((format(printf, 2, 0)))
+can_print_timing_min_max(const char *json_attr, const char *fp_attr,
+			 int min, int max)
 {
 	print_null(PRINT_FP, NULL, fp_attr, NULL);
 	open_json_object(json_attr);
-- 
2.30.2

[PATCH iproute2-next 10/11] tipc: fix clang warning about empty format string

[Stephen Hemminger]

When calling json_print with json only use a NULL instead of
empty string.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 tipc/link.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tipc/link.c b/tipc/link.c
index 9994ada2a367..53f49c8937db 100644
--- a/tipc/link.c
+++ b/tipc/link.c
@@ -332,7 +332,7 @@ static int _show_link_stat(const char *name, struct nlattr *attrs[],
 	open_json_object(NULL);
 
 	print_string(PRINT_ANY, "link", "Link <%s>\n", name);
-	print_string(PRINT_JSON, "state", "", NULL);
+	print_string(PRINT_JSON, "state", NULL, NULL);
 	open_json_array(PRINT_JSON, NULL);
 	if (attrs[TIPC_NLA_LINK_ACTIVE])
 		print_string(PRINT_ANY, NULL, "  %s", "ACTIVE");
-- 
2.30.2

[PATCH iproute2-next 11/11] tunnel: fix clang warning

[Stephen Hemminger]

To fix clang warning about passing non-format string split the
print into two calls.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 ip/tunnel.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/ip/tunnel.c b/ip/tunnel.c
index 88585cf3177b..9d1a745d9d2d 100644
--- a/ip/tunnel.c
+++ b/ip/tunnel.c
@@ -301,10 +301,8 @@ void tnl_print_endpoint(const char *name, const struct rtattr *rta, int family)
 	if (is_json_context()) {
 		print_string(PRINT_JSON, name, NULL, value);
 	} else {
-		SPRINT_BUF(b1);
-
-		snprintf(b1, sizeof(b1), "%s %%s ", name);
-		print_string(PRINT_FP, NULL, b1, value);
+		print_string(PRINT_FP, NULL, "%s ", name);
+		print_string(PRINT_FP, NULL, "%s ",value);
 	}
 }
 
-- 
2.30.2

Re: [PATCH iproute2-next 00/11] Clang warning fixes

[Stephen Hemminger]

On Sat,  8 Jan 2022 12:46:39 -0800
Stephen Hemminger <stephen@networkplumber.org> wrote:

> Building iproute2-next generates a lot of warnings and
> finds a few bugs.  This patchset resolves many of these
> warnings but some areas (BPF, RDMA, DCB) need more work.
> 
> Stephen Hemminger (11):
>   tc: add format attribute to tc_print_rate
>   utils: add format attribute
>   netem: fix clang warnings
>   m_vlan: fix formatting of push ethernet src mac
>   flower: fix clang warnings
>   nexthop: fix clang warning about timer check
>   tc_util: fix clang warning in print_masked_type
>   ipl2tp: fix clang warning
>   can: fix clang warning
>   tipc: fix clang warning about empty format string
>   tunnel: fix clang warning
> 
>  include/utils.h |  4 +++-
>  ip/ipl2tp.c     |  5 ++--
>  ip/iplink_can.c |  5 ++--
>  ip/ipnexthop.c  | 10 ++++----
>  ip/tunnel.c     |  6 ++---
>  tc/f_flower.c   | 62 +++++++++++++++++++++++--------------------------
>  tc/m_vlan.c     |  4 ++--
>  tc/q_netem.c    | 33 +++++++++++++++-----------
>  tc/tc_util.c    | 21 +++++++----------
>  tipc/link.c     |  2 +-
>  10 files changed, 77 insertions(+), 75 deletions(-)
> 

Will resend this after 5.16 merge. Some of these are already fixed